Liquid Waste Management WM-10 - (BMP) Handbooks

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WM-10Liquid Waste Managementwastes (WM-6, Hazardous Waste Management), or concrete slurry residue (WM-8, ConcreteWaste Management).• Typical permitted non-stormwater discharges can include: water line flushing; landscapeirrigation; diverted stream flows; rising ground waters; uncontaminated pumped groundwater; discharges from potable water sources; foundation drains; irrigation water; springs;water from crawl space pumps; footing drains; lawn watering; flows from riparian habitatsand wetlands; and discharges or flows from emergency fire fighting activities.ImplementationGeneral Practices• Instruct employees and subcontractors how to safely differentiate between non-hazardousliquid waste and potential or known hazardous liquid waste.• Instruct employees, subcontractors, and suppliers that it is unacceptable for any liquid wasteto enter any storm drainage device, waterway, or receiving water.• Educate employees and subcontractors on liquid waste generating activities and liquid wastestorage and disposal procedures.• Hold regular meetings to discuss and reinforce disposal procedures (incorporate into regularsafety meetings).• Verify which non-stormwater discharges are permitted by the statewide NPDES permit;different regions might have different requirements not outlined in this permit.• Apply NS-8, Vehicle and Equipment Cleaning for managing wash water and rinse waterfrom vehicle and equipment cleaning operations.Containing Liquid Wastes• Drilling residue and drilling fluids should not be allowed to enter storm drains andwatercourses and should be disposed of.• If an appropriate location is available, drilling residue and drilling fluids that are exemptunder Title 23, CCR § 2511(g) may be dried by infiltration and evaporation in a containmentfacility constructed in conformance with the provisions concerning the Temporary ConcreteWashout Facilities detailed in WM-8, Concrete Waste Management.• Liquid wastes generated as part of an operational procedure, such as water-laden dredgedmaterial and drilling mud, should be contained and not allowed to flow into drainagechannels or receiving waters prior to treatment.• Liquid wastes should be contained in a controlled area such as a holding pit, sediment basin,roll-off bin, or portable tank.• Containment devices must be structurally sound and leak free.• Containment devices must be of sufficient quantity or volume to completely contain theliquid wastes generated.2 of 4 California Stormwater BMP Handbook January 2003Constructionwww.cabmphandbooks.com
Liquid Waste ManagementWM-10• Precautions should be taken to avoid spills or accidental releases of contained liquid wastes.Apply the education measures and spill response procedures outlined in WM-4, SpillPrevention and Control.• Containment areas or devices should not be located where accidental release of thecontained liquid can threaten health or safety or discharge to water bodies, channels, orstorm drains.Capturing Liquid Wastes• Capture all liquid wastes that have the potential to affect the storm drainage system (such aswash water and rinse water from cleaning walls or pavement), before they run off a surface.• Do not allow liquid wastes to flow or discharge uncontrolled. Use temporary dikes or bermsto intercept flows and direct them to a containment area or device for capture.• Use a sediment trap (SE-3, Sediment Trap) for capturing and treating sediment laden liquidwaste or capture in a containment device and allow sediment to settle.Disposing of Liquid Wastes• A typical method to handle liquid waste is to dewater the contained liquid waste, usingprocedures such as described in NS-2, Dewatering Operations, and SE-2, Sediment Basin,and dispose of resulting solids per WM-5, Solid Waste Management.• Methods of disposal for some liquid wastes may be prescribed in Water Quality Reports,NPDES permits, Environmental Impact Reports, 401 or 404 permits, and local agencydischarge permits, etc. Review the SWPPP to see if disposal methods are identified.• Liquid wastes, such as from dredged material, may require testing and certification whetherit is hazardous or not before a disposal method can be determined.• For disposal of hazardous waste, see WM-6, Hazardous Waste Management.• If necessary, further treat liquid wastes prior to disposal. Treatment may include, though isnot limited to, sedimentation, filtration, and chemical neutralization.CostsPrevention costs for liquid waste management are minimal. Costs increase if cleanup or finesare involved.Inspection and Maintenance• Inspect and verify that activity–based BMPs are in place prior to the commencement ofassociated activities. While activities associated with the BMP are under way, inspect weeklyduring the rainy season and of two-week intervals in the non-rainy season to verifycontinued BMP implementation.• Inspect BMPs subject to non-stormwater discharge daily while non-stormwater dischargesoccur.January 2003 California Stormwater BMP Handbook 3 of 4Constructionwww.cabmphandbooks.com
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Liquid Waste Management WM-10 - (BMP) Handbooks

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